Improvement in door-hangers



'0. W. PIERCE. Door-Hangers.

No. 198,997. Pate nt ed Jan. 8, I818.

WZIZWJQJ, [lame/1202 N. PETERS, FNOTOLITNOGRAFHER. WASHINGTON. D C

UNITED STATES PATENT OFFICE.

CHARLES W. PIERCE, OF NEW YORK, N. Y.

IMPROVEMENT IN DOOR-HANGERS.

Specification forming part of Letters PatentNo. 198,997, dated January8, 1878; application filed March 7, 1877.

To all whom it may concern:

Be it known that I, CHARLES W. PIERCE, of New York city, county andState of New York, have invented new and useful Improvements insheave-Pulley Blocks, of which the following is a specification:

My invention consists of a construction of the sheave with an outergrooved ring, a circle of friction-rollers, and a center roller, socontrived that the rings heretofore ordinarily used in connection withthe circle of rollers, and in which the rollers have been journaled, aredispensed with, thus making the sheave much simpler and cheaper, whileat the same time possessing all the anti-friction properties of the moreexpensive contrivance; also, of a simpler and cheaper construction ofthe case or block, all as hereinafter more fully described and claimed.

Figure 1 is a side elevation of my improved sheave-pulley block, withone side of the case removed. Fig. 2 is a sectional elevation.

A is the grooved ring of the sheave, in which the rope runs; B, thecircle of friction-rollers, on which the ring is mounted, and c thecenter roller on which the rollers B Work. The roller 0 is mounted onthe center pin or bolt D, and this bolt holds the two parts E and F ofthe case or block together, close to, but not quite touching, the endsof the rollers, so as to control them, for preventing them from skewingor sheering sidewise, for which also the rollers are made full size tothe ends, and as long as is consistent with the thickness of the sheaveand the necessary freedom at the ends, and they are also of suitablediameter to afford ample bearing-surface at the ends to be guidedproperly by the sides of the case, without sheering or skewing aroundand binding or cramping between the sides of the case. Thus the ringscommonly employed at the ends of the rollers for bearings of journals onthe ends of the rollers are dispensed with making the sheave lessexpensive and more durable.

The part E of the case or block to which ,the support is attached, whichsupport may be the standard G, or a hook or eye at the top, has acircular flange, H, inside of which the edge of the other part, F, fitsat the joint I 61f the two parts, and this flange is extended sficiently below the horizontal axis of the case to form the verticalsupports at J for the part F of theoase, so that no other fasteningbesides the center bolt D is required to secure the block together. 1

The case being cast in the two parts, so as to go together without anyfitting, and so as to be secured by one fastening-bolt, renders theconstruction very cheap and simple.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

The revolving center roller, combined with the intermediate rollers andthe outer wheel or ring, and having its support on a centerpin, which issupported at one end in the stationary part of the case, and at theother end in the removable part of the case, which is itself supportedby an overlapping flange of the stationary part, substantially asdescribed, for the purpose set forth.

CHARLES W. PIERCE.

Witnesses F. A. THAYER, WM. J. MORGAN.

